[Code of Federal Regulations]

[Title 47, Volume 5]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 47CFR101.107]



[Page 640-641]

 

                       TITLE 47--TELECOMMUNICATION

 

                         COMMISSION (CONTINUED)

 

PART 101_FIXED MICROWAVE SERVICES--Table of Contents

 

                      Subpart C_Technical Standards

 

Sec. 101.107  Frequency tolerance.



    (a) The carrier frequency of each transmitter authorized in these 

services must be maintained within the following percentage of the 

reference frequency except as otherwise provided in paragraph (b) of 

this section or in the applicable subpart of this part (unless otherwise 

specified in the instrument of station authorization the reference 

frequency will be deemed to be the assigned frequency):



------------------------------------------------------------------------

                                                              Frequency

                      Frequency (MHz)                         tolerance

                                                              (percent)

------------------------------------------------------------------------

928 to 929 \5\............................................       0.0005

932 to 932.5..............................................       0.00015

932.5 to 935..............................................       0.00025

941 to 941.5..............................................       0.00015

941.5 to 944..............................................       0.00025

952 to 960 \5\............................................       0.0005

1,850 to 1,990............................................       0.002

2,110 to 2,200............................................       0.001

2,450 to 2,500 \1\........................................       0.001

3,700 to 4,200 \1\........................................       0.005

5,925 to 6,875 \1\........................................       0.005

10,550 to 11,700 \1\ \2\..................................       0.005

11,700 to 12,200 \1\......................................       0.005

12,200 to 13,250 \4\......................................       0.005

14,200 to 14,400..........................................       0.03

17,700 to 18,820 \3\......................................       0.003

18,820 to 18,920 \3\......................................       0.001

928 to 929 \5\............................................       0.0005

18,920 to 19,700 \3\......................................       0.003

19,700 to 27,500 \4\ \7\..................................       0.001

27,500 to 28,350..........................................       0.001

29,100 to 29,250..........................................       0.001

31,000 to 31,300 \6\......................................       0.001

31,300 to 40,000 \4\......................................       0.03

71,000 to 76,000 \8\......................................  ............

81,000 to 86,000 \8\......................................  ............

92,000 to 95,000 \8\......................................  ............

------------------------------------------------------------------------

\1\Applicable only to common carrier LTTS stations. Tolerance for 2450-

  2500 MHz is 0.005%. Beginning Aug. 9, 1975, this tolerance will govern

  the marketing of LTTS equipment and the issuance of all such

  authorizations for new radio equipment. Until that date new equipment

  may be authorized with a frequency tolerance of .03% in the frequency

  range 2,200 to 10,500 MHz and .05% in the range 10,500 MHz to 12,200

  MHz, and equipment so authorized may continue to be used for its life

  provided that it does not cause interference to the operation of any

  other licensee. Beginning March 1, 2005, new LTTS operators will not

  be licensed and existing LTTS licensees will not be renewed in the

  11.7-12.2 GHz band.

\2\ See subpart G of this part for the stability requirements for

  transmitters used in the Digital Electronic Message Service.



[[Page 641]]





\3\ Existing type accepted equipment with a frequency tolerance of 0.03% may be marketed until December 1, 1988.

  Equipment installed and operated prior to December 1, 1988 may

  continue to operate after that date with a minimum frequency tolerance

  of 0.03%. However, the replacement of equipment

  requires that the current tolerance be met.

\4\ Applicable to private operational fixed point-to-point microwave and

  stations providing MVDDS.

\5\ For private operational fixed point-to-point microwave systems, with

  a channel greater than or equal to 50 KHz bandwidth, 0.0005%; for multiple address master stations, regardless of

  bandwidth, 0.00015%; for multiple address remote

  stations with 12.5 KHz bandwidths, 0.00015%; for

  multiple address remote stations with channels greater than 12.5 KHz

  bandwidth, 0.0005%.

\6\ For stations authorized prior to March 11, 1997, transmitter

  tolerance shall not exceed 0.03%.

\7\ The frequency tolerance for stations authorized on or before April

  1, 2005 is 0.03%. Existing licensees and pending applicants on that

  date may continue to operate after that date with a frequency

  tolerance of 0.03%, provided that it does not cause harmful

  interference to the operation of any other licensee. For analog

  systems, if the channel bandwidth is greater than 30 MHz up to 50 MHz,

  the frequency tolerance standard will be 0.03%; if the channel

  bandwidth is 30 MHz or less, then the frequency tolerance standard

  will be 0.003%. This analog standard is conditional provided that

  harmful interference is not caused to digital stations operating

  within the 0.001% tolerance standards. If harmful interference is

  caused to stations operating with the more stringent standard, the

  onus shall be on the operators with the less stringent parameters to

  develop an engineering solution to the problem. For exceptions, see

  Sec. 101.147 and Sec. 101.507.

\8\ Equipment authorized to be operated in the 71,000-76,000 MHz, 81,000-

  86,000 MHz, 92,000-94,000 MHz and 94,100-95,000 MHz bands is exempt

  from the frequency tolerance requirement noted in the table of

  paragraph (a) of this section.



    (b) Heterodyne microwave radio systems may be authorized at a 

somewhat less restrictive frequency tolerance (up to .01 percent) to 

compensate for frequency shift caused by numerous repeaters between base 

band signal insertion. Where such relaxation is sought, applicant must 

provide all calculations and indicate the desired tolerance over each 

path. In such instances the radio transmitters and receivers used must 

individually be capable of complying with the tolerance specified in 

paragraph (a) of this section. Heterodyne operation is restricted to 

channel bandwidth of 10 MHz or greater.

    (c) As an additional requirement in any band where the Commission 

makes assignments according to a specified channel plan, provisions must 

be made to prevent the emission included within the occupied bandwidth 

from radiating outside the assigned channel at a level greater than that 

specified in Sec. 101.111.



[61 FR 26677, May 28, 1996, as amended at 62 FR 23167, Apr. 29, 1997; 63 

FR 6105, Feb. 6, 1998; 63 FR 9448, Feb. 25, 1998; 63 FR 14039, Mar. 24, 

1998; 63 FR 36611, July 7, 1998; 66 FR 35110, July 3, 2001; 67 FR 43038, 

June 26, 2002; 68 FR 4956, Jan. 31, 2003; 69 FR 3266, Jan. 23, 2004; 69 

FR 16832, Mar. 31, 2004; 70 FR 4787, Jan. 31, 2005]